The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"The Guide is meant to be suggestive, not exhaustive; it does not claim to be a complete bibliography of the subject, but to indicate the general drift of the 9000 and odd books enumerated."--Pref
Titles and headings given in briefest form. Symbols are used to indicate (1) Books especially noteworthy. (2) Books given in Pritzel's Thesaurus, ed. 2, but here corrected or added to. (3) Books not given in Pritzel
Arranged in 21 main classes, with 124 subdivisions